SOME of the more liberal of the presses here are discussing the question of a zollverein between the United States and Canada. It is proposed to form a union for commercial purposesto altogether abolish the frontier tariff line, with its double sets of custom house officials now existing between the two countries, and to agree upon one tariff for both, the proceeds of this tariff to be divided between the two governments on the basis of population. It is said that a large proportion of the merchants of Canada are in favor of this step, as they believe it would materially add to the business of the country, by removing the restrictions that now exist on trade between Canada and the States. Those persons who are opposed to the measure believe that it would increase the material welfare of the country, but it would loosen the bonds between Canada and England; and this sentiment overrides the desire for commercial prosperity. Whether the sentiment can continue to bear the strain put upon it is a question. It is thought by many that commercial considerations must in the end prevail. It seems also to be generally agreed that such a zollverein, or common customs union, would bring practically more benefits to the Canadian provinces than to the United States. (It seems to me a certainty of time, sooner or later, that Canada shall form two or three grand States, equal and independent, with the rest of the American Union. The St. Lawrence and lakes are not for a frontier line, but a grand interior or mid-channel.)